Prestige Indoor Air Quality (IAQ) 2.0 comfort system controls up to three whole-house systems: humidifier, dehumidifier, air conditioner, and ventilation. Adjusts temperature from anywhere in the home with Portable Comfort Control. High-definition, full-color, easy-to-read display. Interview-based programming asks questions and programs itself based on the answers. Connects to the Internet to allow monitoring and controlling HVAC system with smart phone, PC, or tablet. Displays outdoor temperature and humidity on home screen of thermostat. Diagnoses system problems or failures before they occur. Seven-day programming allows unique settings for each day of the week. May save up to 33% on annual heating and cooling costs, if used as directed. (Savings may vary depending on geographic region and usage.) Automatically adjusts home temperature when utility prices are at peak to help save on energy costs. Controls both temperature and air-quality systems such as humidifier, dehumidifier, and ventilation from single control point. Settings can be displayed in English, Spanish or French. Model numbers: THX9321R5000, YTHX9321R5030, YTHX9321R5012, YTHX9321R5079, YTHX9321R5003, YTHX9321R5061, THX9421R5005, THX9421R5013, YTHX9321R5002, YTHX9421R5051, YTHX9421R5028, YTHX9421R5069, YTHX9421R5010, YTHX9421R5077. Five-year-warranty.